Sitting for more than 30 minutes at a time is linked to a higher risk of dying from cancer, while breaking up long sitting spells with light activity appeared to lower that risk, according to new data. But media reports of the study left many questions unanswered. Here’s what you need to know.

What did this study actually find?

The main message is simple: it’s not just how long you sit each day, but how you sit that seems to matter. People who stayed seated for long, uninterrupted stretches – 30 minutes or more at a time – had a higher risk of dying from cancer. By contrast, those who got up regularly, even just to stand or walk briefly, appeared to have a lower risk. In other words, two people might sit for the same total number of hours in a day, but the one who breaks it up more often may be better off.

Does this mean sitting causes cancer?

No, this study does not show that sitting causes cancer. It shows a link between long periods of uninterrupted sitting and a higher risk of dying from cancer, but that is not the same as proving one causes the other.

Studies like this observe people’s habits and what happens to them over time, but they cannot fully account for every difference between individuals. Other factors – such as general health, diet or lifestyle – could also play a role in explaining the findings.

Could it be the other way round?

Yes,........

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